Boring machine



Dec. 8,1925. 1,564,876

J. H. MANSFIELD BORING MACHINE Filed Aug. 8. 1921 3 Sheets-Sheet 1 n Ni Dec- 8,1925L 1,564,876

J. H. MANSFIELD BORING MACHINE Filed Aug. a, 1921 3 Sheets-Sheet 2 Dec. 8, 1925. Y 1564;876

J. H. MANSFIELD BORING MACHINE v Filed Aug. 8, 1921 3 Sheets-Sheet 3' Patented Dec. 8, 1925.

UNITED STATES 1,564,875 PATENT or ice.

JULDSON H. MANSFIELD, F ROCKFORD, ILLINOIS, AssIGnoR T0 GBEENLEE BROS. & co., 0F ROCKFORD, ILLINOIS, A CORPORATION OF ILLINOIS.

BORING MACHINE.

Application filed. August a, 1921. Serial No. 490,679.

To all whom it may concern:

Be it known that I, JUDsoN H. MANS- FIELD, a citizen of the United States, residing at Rockford, in the county of Winnebago and State of Illinois, have invented certain new and useful Improvements in Boring Machines, of which the following is a specification.

This invention pertains in general to bor- 0 ing and drilling machines, and has more particular reference to a single spindle motor-driven wood boring machine, although as will be understood from the following description, my invention is of general application to boring and drilling machines without, limitation as to the material being bored or drilled.

One of the primary objects of this invention is to provide a boring machine of novel design characterized by an overhead motordriven spindle, which is guided and adapted to be reciprocated at its tool-carrying end by a bearing slide. This insures rigidity of the chuck or tool end of the spindle at all times by reason of the substantial bearing and support provided by the traveling hearing slide.

Another important object is to incorporate in a boring machine, novel features of design and construction, by which compact .ness and comparatively light-weight of reciprocating parts are obtained. and which are also conducive to accuracy and ease 0f operation as compared with other machines designed for a similar purpose.

Another object is to provide a boring machine constructed in such simple and novel manner that it will serve practically andeffectually the purposes intended and shall be capable of production at a comparatively low cost.

Otherobjects and attendant advantages will be appreciated by those familiarwith this art as the invention becomes better.

Fig. 4 a horizontal sectional view tak'en substantially on the line 44 of Fig. 3,

showing the spindle-bearing slide as moved to a lowermost position; and

Fig. 5 anenlarged sectional view through the motor and spindle bearing slide taken substantially on "the line 5-5 of Fig. 1. Inasmuch as my invention has reference mainly to the mounting, drive and operation of the tool spindle and parts appurtenant thereto, the construction of the remaining parts of the boring machine is not important, and a complete boring machine is shown in the drawing simply for the purpose of more clearly illustrating the present invention. For example, the standard 7,

table knee 8 and table 9 {might be of any suitable or preferred construction. In the present case, the knee 8 is vertically adjust:

able by means of the hand crank 11 and the table 9 is rotatably adjustable about the vertical center-pin 12, and is adapted to .be tilted about the pivot pin 13 to different angles with respect to the horizontal.

My invention contemplates a standard head 14 overhanging the table and provided on its front face with vertical ways 15. A motor-mounting bracket designated generally by character 16, is bolted to the face of the head 14; andis shaped to. provide ways 17 complemental to the ways 15. Upon and between these ways is mounted for vertical reciprocation a spindle bearing slide designated generally by character 18. The vertical ways are of a length sufiicient to An adjustable gib 19 is employedfor taking up wear of the slide and ways. The slide has, as shown plainly in Figs. 4 and 5, machined longitudinal sides 21 which slide on the' ways 15 and carries intermediate said sides, a spindle bearing housing 22. In this housing is carried, radial and thrust bearing designated generally by 23, the outer race 24.- of which is secured in the housing by means of an end cap 25 and the i-nnerrace 26 is secured upon the tool spindle 27 and against the shoulder 28 thereof by means anoil ring collar 29 threaded on the spindle. The housing 22 provides asis obvious, an oil receptacle for the bearing. The lower end of the. spindle projects ard.

through the housing 22 and is tapered to carry a tool chuck. This end of the spindle may be constructed in any suitable manner for the attachment thereto of the tool.

An electric motor designated generally by character 31 concentric with the spindle is employed fordriving the latter. The motor base 32 is bolted to the horizontal ledge 33 of the bracket 16. By reason of this construction the bracket 16 serves the dual purpose of providing ways for the spindle bearing slide and of supporting the motor, thus reducing the parts and machining operations for these purposes to a minimum. A tool spindle is splined substan tially throughout its length as shown in Fig. 5, in connection with the motor shaft or rotor 33 which is shown in the form of a sleeve. The rotor may be mounted in a suitable manner in the motor housing, and at present is supported on a lower bearing 34 and upper bearing 35. It will be observed that when the spindle bearing slide 18 is in its highest position as shown in Fig. 5, the upper end of the spindle reaches to the top of the motor shaft but terminates within the cap 36 which closes the upper end of'the motor. This gives a dust and dirt proof structure and at the same time allows a spindle feed of considerable length by reason of the splines 37 on the rotor being positioned at the lower end thereof. From the foregoing it will be manifest that the motor, tool spindle and the spindle-bearing slide are co-operatively mounted in very compact and substantial relation, which insures rigidity and stability of the spindle at every point in its feed. In other words, the tool end of the spindle is supported with equal rigidity at its lowermost and at any intermediate point as well as when elevated.

Suitable means is now provided for vertically reciprocating the spindle-bearing slide and at present I have provided both a hand and foot operated feed. This consists of a lever 38 pivotally connected at 39 to the spindle-bearing slide and pivotally mounted at 41 on the upper end of a link 42 which is pivotally supported on the standard at 43. To the rear end of the lever 38 is attached a rod 44 which connects at its lower end to a foot treadle 45 pivotally mounted at 46 on the base of the stand- By depressing the foot treadle, the spindle will be fed downwardly as will be obvious. A counter-balance spring 47 connected at its lower end with the standard and at its upper end with the lever 38 serves to return the spindle to its elevated position. A hand lever 48 rigidly attached to the lever 38 may be manipulated forwardly and rearwardly for reciprocating the spindle. Regarding the connection between the lever 38 and spindle-bearing slide, it will be observed that the standard head 14 is shaped to provide an opening 40, giving clearance to permit reciprocation of these parts. Because of the construction herein disclose-d, including the use of a lever for reciprocating the spindle-bearing slide, an extremely quick action may be had for feeding and returning the tool spindle, which is very desirable in wood-boring machines. This quick action is further facilitated by reason of the present 'construction which permits the reciprocating parts to be comparatively light without sacrificing rigidity and accuracy in the carriage of the spindle.

Adjustable stops are provided for limiting the feed and return movements of the spindle. At present, these consists of upper and lower stops 49 and 51, respectively, vertically adjustable on the rod 52 secured to the bracket 16. A lug 53 projecting laterally from the spindle bearing housing 22 slides on the rod 52 and is adapted to abut against the stops 49 and 51 for the purpose described. The stops 49 and 51 may be set at any position on the rod 52 to limit the range of the spindle feed. The adjustable rods 53 are for stopping the wood or other work-piece from being lifted from the table when the spindle is retracted. These latter stops are not essential to the present invention.

From the foregoing it will be apparent that the motor, tool spindle and immediate means for feeding the spindle are very compactly arranged in co-operative relation; that the provision of a spindle-bearing slide for the lower end of the spindle guided throughout the spindle movement on ways on the head or standard, insures a rigid and stable bearing support for the tool end of the spindle, and every point in the feed, thereby promoting greater accuracy and reliability of operation, a superior grade of work and a smaller percentage of tool breakage than in those constructions in which the projected end of the spindle is unsupported by a main bearing, such as provided herein, when in the extended position; and that by co-ordinating the motor-mounting bracket, the motor, the spindle and the spindle-bearing slide on the standard in the arrangement disclosed, a very simple and durable construction is obtained, capable of production at a comparatively low cost and adapted to serve practically and efficiently the purposes intended. It should also be observed that by reason of the principles disclosed herein the reciprocating parts may be of comparatively light weight, thus promoting case of operation. This advantage is especially noticeable in comparison with those overhead motor driven boring machines in which the motor reciprocates with the spindle. v

The use of the term boring in the specification and claims is in no sense a limitation to the cutting of Wood, but comprehends both boring and drilling or producing holes usually circular in cross-section, either in solid material, orby reboring by means of a rotary cutter. I

It is believed that the foregoing conveys a clear understanding of the objects prefaced above, and while I have illustrated but a single Working embodiment, it should be understood that considerable change might be made in the construction and arrangement Without departing from the spirit and scope of the invention as expressed in the appended claims, in which,

I claim: v

1. In a boring machine of'the character described, the combination of a work table,

a standard overhanging thetable and'having vertical Ways on its front face andan opening between said ways, a motor-supporting bracket secured to said standard and having vertically disposed portions providing ways complemental to those on the standard and a horizontally disposed top portion providing a motor-supporting part,

a motor rigidly mounted on said part on a vertical axis, a spindle-bearing slide reciprocable upon and between said Ways,

a spindle journaled at its tool-carrying end on said slide andftelescoping within the motor, a driving connection between the motor and spindle, and means reaching through'said opening in the frame for'reciprocating the spindle-bearing slide, V

2. In a boringmachine of the character. described, the combination of a Work table,

and shaped to provideways complemental to those on the standard and a motor-sup porting part at' one end of said Ways, a

motor" rigidly mounted on said part, "a

spindle-bearing slide reciprocable upon and between said ways, a toolspindlejournaled as I at its spindle-carrying end on said slide and 7 adapted to be reciprocated thereby, the opand a driving connection between 1 1i posite end of the spindle telescoping withinthe motor, the motor and spindle.

'JUDS'ON H. MANSFIELD. 

